/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.http.examples.client;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

/**
 * An example that performs GETs from multiple threads.
 *
 */
public class ClientMultiThreadedExecution {
	
	public static void main(String[] args) throws InterruptedException, IOException {
		// Create an HttpClient with the ThreadSafeClientConnManager.
		// This connection manager must be used if more than one thread will
		// be using the HttpClient.
		PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
		cm.setMaxTotal(100);
		
		CloseableHttpClient httpclient = HttpClients.custom().setConnectionManager(cm).build();
		try {
			// create an array of URIs to perform GETs on
			String[] urisToGet = { "http://hc.apache.org/", "http://hc.apache.org/httpcomponents-core-ga/", "http://hc.apache.org/httpcomponents-client-ga/", };
			
			// create a thread for each URI
			GetThread[] threads = new GetThread[urisToGet.length];
			for (int i = 0; i < threads.length; i++) {
				HttpGet httpget = new HttpGet(urisToGet[i]);
				threads[i] = new GetThread(httpclient, httpget, i + 1);
			}
			
			// start the threads
			for (int j = 0; j < threads.length; j++) {
				threads[j].start();
			}
			
			// join the threads
			for (int j = 0; j < threads.length; j++) {
				threads[j].join();
			}
			
		} finally {
			httpclient.close();
		}
	}
	
	/**
	 * A thread that performs a GET.
	 */
	static class GetThread extends Thread {
		
		private final CloseableHttpClient httpClient;
		private final HttpContext context;
		private final HttpGet httpget;
		private final int id;
		
		public GetThread(CloseableHttpClient httpClient, HttpGet httpget, int id) {
			this.httpClient = httpClient;
			this.context = new BasicHttpContext();
			this.httpget = httpget;
			this.id = id;
		}
		
		/**
		 * Executes the GetMethod and prints some status information.
		 */
		@Override
		public void run() {
			try {
				System.out.println(id + " - about to get something from " + httpget.getURI());
				CloseableHttpResponse response = httpClient.execute(httpget, context);
				try {
					System.out.println(id + " - get executed");
					// get the response body as an array of bytes
					HttpEntity entity = response.getEntity();
					if (entity != null) {
						byte[] bytes = EntityUtils.toByteArray(entity);
						System.out.println(id + " - " + bytes.length + " bytes read");
					}
				} finally {
					response.close();
				}
			} catch (Exception e) {
				System.out.println(id + " - error: " + e);
			}
		}
		
	}
	
}
